LABORATORY REVIEW
MOLECULAR BIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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bind to promoter region on the DNA
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unwind the DNA double helix
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start chain from stretch
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stop the transcription
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Detailed explanation-1: -The main function of RNA polymerase is to transcribe RNA molecules using DNA as a template. RNA polymerase is a multi-unit intermediary enzyme that plays a key role in the transcription process during which the information stored in a DNA molecule is copied into a new molecule of mRNA (messenger RNA).
Detailed explanation-2: -RNA polymerase will keep transcribing until it gets signals to stop. The process of ending transcription is called termination, and it happens once the polymerase transcribes a sequence of DNA known as a terminator.
Detailed explanation-3: -Termination is the ending of transcription, and occurs when RNA polymerase crosses a stop (termination) sequence in the gene. The mRNA strand is complete, and it detaches from DNA.
Detailed explanation-4: -RNA Pol I: It synthesises pre-rRNA subunits that form the ribosomes. RNA Pol II: It synthesises precursors of microRNA, snRNA and mRNA. RNA Pol III: It synthesises tRNA, other precursors of rRNA and some small RNAs.